Improved bolt



illlnited *gt-atta pete-cpm,

Lam Patent No. 93,006, vamai .my 27, 1869.

IMPROVED BOLT.

The Schedule referred to in these Letters Patent and making part of thesame.

To all lwhom. it may vconcern Be it known that I, E. L. ROBERTS, ofBrooklyn, in the county of Kings, and State of New York, have invented anew and useful Improvement in Bolts for Folding Doors; and I do herebydeclare that the follow'- ing is a full, clear, and exact descriptionthereof, which will enable others skilledrin the a'rt to make and usethe same, reference being had to the accompanying drawings, forming partof this specification.

This invention relates to improvements in sliding bolts for foldingdoors, such as patented to me, March 15, 1859, No. 23,262, the object ofwhich is to provide for sliding the 'upper fastening-bolt, and thelaterallymoving guard-bolt, .whether the lower slide-bolt coincide withits mortise, so as to fall into it or not, as it frequent-ly happensthat it does not ou closing the door, owing to warping or springing,which, in the arrangement described in the aforesaid patent, preventsthe movement of any of the bolts until the said lower bolt is adjustedto coincide and pass into its notch.

Figure '1 represents a sectional elev. tion of my improved fastening,'as applied to one of a pair of folding doors; and

Figure 2 represents a modified arrangement of the same.

Simihr letters of reference indicate corresponding parts.

The object of the invention described in the aforesaid patent, is toprevent closing both the doors properly until the fastening-bolts (topand bottom) of one door have been forcedhome in the notches provided forthem; and to accomplish this, a bolt, A, is so combined with the spindleB, by which the top and bottom vboltsv are operated, as to be thrown ontof the edge of the d`oor C, when the bolts D E are withdrawn, so as toprevent the closing of the door'F until the said bolts D E are forcedhome, which withdraws the bolt A.

In carrying o ut this invention practically,-I have found that when thedoors warp and spring, as Ithey generally do in ashort timeafter beinghung, the bot` tom bolts will not .coincide with the notches providedfor them, when the top of the door is arrested by the stops usuallyprovided for them at the top, requiring care to be taken to properlyadjust the bottom before the bolts can be shot.

I therefore propose i the latter will not obstruct the movement of thespindle. necessary for shooting the bolt E, and'withdrawing bolt E to toso connect the rod D" that the boa A, leaving the boit D to fau into asnach, 0r to be forced therein by a spring, when, bythe vibrationimparted to the bottom of the door G, by the jarring of freely in theslot, to permit the rod to work in and ont ,v

of the axial hole to some extent.

A spiral spring, H, isarranged on the rod D', and bearing against thetop of the-bolt, soasto Vhavea constant tendency to press the bolt down.In this arrangement, if the bolt D fails to enter its notch, the rod Dwill, on 11e turning of the spindle,

be forced down into the axial hole compressing the spring, the pin Gsliding in the slot 'of the bolt D, thereby permitting the bolts E and Ato be shot, and when the said bolt D coincides with its notch, thespring will force it down.

In tig. 2, I have represented the Vslide I, to which the operating-crankL is connected, yand to which the rod D is represented as rigidlyconnected in' fig. 1, as having a recess, K, and the bolt D as connectedto theslide, below the recess, so as to move in the said slide to someextent, and having a spiral spring, M, pressing against the underside ofthe sliding block M, to force the rod D', and the bolt D, which, in thiscase, will be rigidly connected to it, down.

This arrangement will have the same Vpractical operation as the other,and vother similar arrangements maybe employed.

Having thus described my invention,

I claim as new, and desire to secure Patent- The combination, with thedoor G, of the bolts E, A, and D, when the bolt A is arranged to bethrown outgwhen the said bolts E A are withdrawn, and cica fum-sa, andwhen the bolt D is arranged to permit the be shot and the bolt A to bewithdrawn, whether the said bolt D falls into its notch or not,substantially as specified.

The above specification of Lmy invention signed by me, this27th dayofMay, 1869.

' E. L. RQBERTS.

by Letters Witnesses:

' FRANKBLOOKLEY,

An'nx. F. ROBERTS.

